135 lines
3.7 KiB
C
135 lines
3.7 KiB
C
/* $NetBSD: iommu.c,v 1.8 1998/02/05 04:57:57 gwr Exp $ */
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/*-
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* Copyright (c) 1996 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jeremy Cooper.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Set-up functions for the Sun3x DVMA I/O Mapper.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/conf.h>
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#include <sys/buf.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <machine/autoconf.h>
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#include <sun3/sun3x/iommu.h>
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#include <sun3/sun3x/obio.h>
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#define IOMMU_SIZE (IOMMU_NENT * sizeof(iommu_pde_t))
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static int iommu_match __P((struct device *, struct cfdata *, void *));
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static void iommu_attach __P((struct device *, struct device *, void *));
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struct cfattach iommu_ca = {
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sizeof(struct device), iommu_match, iommu_attach
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};
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static iommu_pde_t *iommu_va;
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static int
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iommu_match(parent, cf, args)
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struct device *parent;
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struct cfdata *cf;
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void *args;
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{
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/* This driver only supports one unit. */
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if (cf->cf_unit != 0)
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return (0);
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return (1);
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}
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static void
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iommu_attach(parent, self, args)
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struct device *parent;
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struct device *self;
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void *args;
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{
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struct confargs *ca = args;
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iommu_va = (iommu_pde_t *)
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bus_mapin(ca->ca_bustype, ca->ca_paddr, IOMMU_SIZE);
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printf("\n");
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}
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void
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iommu_enter(sa, pa)
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u_int32_t sa; /* slave address */
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u_int32_t pa; /* phys. address */
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{
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int pn;
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#ifdef DIAGNOSTIC
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if (sa > (1<<24))
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panic("iommu_enter: bad sa");
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#endif
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/* Convert the slave address into a page index. */
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pn = IOMMU_BTOP(sa);
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/* Mask the physical address to insure it is page aligned */
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pa &= IOMMU_PDE_PA;
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pa |= IOMMU_PDE_DT_VALID;
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iommu_va[pn].addr.raw = pa;
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}
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void
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iommu_remove(sa, len)
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u_int32_t sa; /* slave address */
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u_int32_t len;
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{
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int pn;
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#ifdef DIAGNOSTIC
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if (sa > (1<<24))
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panic("iommu_enter: bad sa");
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#endif
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pn = IOMMU_BTOP(sa);
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while (len > 0) {
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iommu_va[pn++].addr.raw = IOMMU_PDE_DT_INVALID;
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len -= IOMMU_PAGE_SIZE;
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}
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}
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